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Time-Variable Gravity Field and Global Deformation of the Earth

In: Handbook of Geomathematics

Author

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  • Jürgen Kusche

    (Bonn University, Astronomical, Physical and Mathematical Geodesy Group)

Abstract

The analysis of the Earth’s time-variable gravity field and its changing patterns of deformation plays an important role in Earth system research. These two observables provide, for the first time, a direct measurement of the amount of mass that is redistributed at or near the surface of the Earth by oceanic and atmospheric circulation and through the hydrological cycle. In this chapter, we will first reconsider the relations between gravity and mass change. We will in particular discuss the role of the hypothetical surface mass change that is commonly used to facilitate the inversion of gravity change to density. Then, after a brief discussion of the elastic properties of the Earth, the relation between surface mass change and the three-dimensional deformation field is considered. Both types of observables are then discussed in the framework of inversion. None of our findings are entirely new; we merely aim at a systematic compilation and discuss some frequently made assumptions. Finally, some directions for future research are pointed out. Time-variable gravity (TVG) field

Suggested Citation

  • Jürgen Kusche, 2015. "Time-Variable Gravity Field and Global Deformation of the Earth," Springer Books, in: Willi Freeden & M. Zuhair Nashed & Thomas Sonar (ed.), Handbook of Geomathematics, edition 2, pages 321-338, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-54551-1_8
    DOI: 10.1007/978-3-642-54551-1_8
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